Display screen or portion thereof with a graphical user interface



The patent or application file contains at least one drawing executed in color, Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.

The FIGURE is a front view of a display screen or portion thereof with a graphical user interface showing the new design.

The broken lines showing a display screen, text, and graphical elements form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 